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. 2020 Mar 20;10:5149. doi: 10.1038/s41598-020-62059-y

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© The Author(s) 2020

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Use of various models to fit the kinetic data recorded for the adsorption of p-nitrophenol onto biochar samples (q_t: amount of p-nitrophenol adsorbed at time point t) prepared at different pyrolysis temperatures: (a) PC300, (b) PC400, (c) PC500, (d) PC600, and (e) PC700 via the nonlinear regression method; (f) intra-particle diffusion model for five biochar samples. Please note that in the mentioned adsorption reaction, the concentration of p-nitrophenol was 100 mg/L and the dosage of biochar was 0.1 g/0.02 L. The adsorption experiments were conducted at a pH of 6 and at 35 °C, and the amount of p-nitrophenol adsorbed onto biochar was measured at the indicated time points.